This commit also extends configuration of the multilib option, adding
the ability to exlcude multilib repository from repositories list
Note, that in order to support repository list and mirror correctly,
alpm configuration section is now architectture specific
Some commands have been moved to another group and thus having another
default name (old subcommands are still available...for now):
* daemon -> repo-daemon
* key-import -> service-key-import
* repo-clean -> service-clean
* repo-config -> service-config
* repo-config-validate -> service-config-validate
* repo-setup -> service-setup
* repo-shell -> service-shell
* version -> help-version